6 Installation
Installer and user reference guide
30
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P561157-1 – 2018.09
a
b
d
d
d
c
b
g
g
h
h
c
f
f
f
h
e
e
e
a
h
h
h
h
h
i
a
Field power supply (with earth leakage protector)
b
Main switch
c
Earth connection
d
Outdoor unit
e
Indoor unit
f
User interface
g
Indoor power supply wiring (sheathed cable) (230 V)
h
Transmission wiring (sheathed cable) (16 V)
i
Outdoor power supply wiring (sheathed cable)
Power supply 3N~ 50/60 Hz
Power supply 1~ 50/60 Hz
Earth wiring
6.8.3
About the electrical wiring
It is important to keep the power supply and the transmission wiring
separated from each other. In order to avoid any electrical
interference the distance between both wiring should always be at
least 25 mm.
NOTICE
▪ Be sure to keep the power line and transmission line
apart from each other. Transmission wiring and power
supply wiring may cross, but may not run parallel.
▪ Transmission wiring and power supply wiring may not
touch internal piping (except the inverter PCB cooling
pipe) in order to avoid wire damage due to high
temperature piping.
▪ Firmly close the lid and arrange the electrical wires so
as to prevent the lid or other parts from coming loose.
The transmission wiring outside the unit should be wrapped and
routed together with the field piping.
Field piping can be routed from front or bottom of the unit (going left
or right). Refer to
"6.4.3 To route the refrigerant piping" on page 19
.
▪ Be sure to follow the limits below. If the unit-to-unit cables are
beyond these limits, it may result in malfunction of transmission:
▪ Maximum wiring length: 1000 m.
▪ Total wiring length: 2000 m.
▪ Maximum inter unit wiring length between outdoor units: 30 m.
▪ Transmission wiring to cool/heat selector: 500 m.
▪ Maximum number of branches: 16.
▪ Maximum number of independent interconnectable systems: 10.
▪ Up to 16 branches are possible for unit-to-unit cabling. No
branching is allowed after branching (see figure below).
For the above wiring, always use vinyl cords with 0.75 to 1.25 mm
2
sheath or cables (2-core wires). (3-core wire cables are allowable for
the cooler/heater changeover user interface only.)
6.8.4
Guidelines when knocking out knockout
holes
▪ To punch a knockout hole, hit on it with a hammer.
▪ After knocking out the holes, we recommend removing any burrs
and paint the edges and areas around the holes using repair paint
to prevent rusting.
▪ When passing electrical wiring through the knockout holes.
prevent damage to the wires by wrapping the wiring with
protective tape, putting the wires through field supplied protective
wire conduits at that location, or install suitable field supplied wire
nipples or rubber bushings into the knockout holes.
a
b
c
d
a
Knockout hole
b
Burr
c
Remove burrs
d
If there are any possibilities that small animals enter the
system through the knockout holes, close the holes with
packing materials (to be prepared on-site)
6.8.5
To route and fix the transmission wiring
Transmission wiring can be routed through the front side only. Fix it
to the upper mounting hole.
b
a
A
b a
c
c
c
d
c
d
c
8 HP
10~16 HP
A
A
a
Transmission wiring (possibility 1)
(a)
b
Transmission wiring (possibility 2)
(a)
. Fix to pipe insulation
with tie wraps.
c
Tie wrap. Fix to factory-mounted low voltage wiring.
d
Tie wrap.
(a)
Knockout hole has to be removed. Close the hole to avoid
small animals or dirt from entering.